Pigsty floor
I thought the plan would be to dig all the floors out, ram in a load of rubble and concrete over the top. Well, of course, they don't do it like that here. Miloš wondered why I'd want to generate so much extra work. The floors have collapsed as much as they're going to, we just need to level it up with sand and pour a slab over it. Well, ok, I'll just have to make up the ground outside a few inches to make up for it.
Levelling it up with sand:
Layer of felt:

This is to protect the layer of polythene that stops moisture going into the slab (which you'll have to imagine...)
Reinforcing:

The boards are to make it easier to push a loaded wheelbarrow across the mesh.
I poured 7 loads down each side and then Miloš came in to level it up:
Then I poured 8 loads in twice, with Milođ levelling it up in between:

Followed by another 3 as it approached the door. 7+7+8+8+3=33. My pour back...
Finito
Also, while we were doing that, the wood turned up:
Which we laid out upstairs to continue drying/get it out of the way
Dammit, I can't see that lovely roof now

Surprisingly my back actually improved after that lot
